[Bug 744096] New: compositor, videoaggregator: ignores input timestamps if input buffers have no duration

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=744096
  GStreamer | gst-plugins-bad | git master

           Summary: compositor, videoaggregator: ignores input timestamps
                    if input buffers have no duration
    Classification: Platform
           Product: GStreamer
           Version: git master
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: t.i.m at zen.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


If input buffers have no duration set on them, as is usually the case with live
sources (rtp, v4l2src), compositor seems to just ignore the input buffer
running time completely and the mixed output is completely bogus. This makes it
very clear (but it happens in real live as well if input framerate != output
framerate, obviously causing a/v sync issues if audio is involved): 

$ wget http://people.freedesktop.org/~tpm/samples/bipbop-gear4.ts
$ gst-launch-1.0 uridecodebin uri=file://`pwd`/bipbop-gear4.ts name=d ! queue !
timeoverlay time-mode=running-time font-desc=Sans,36 ! compositor ! timeoverlay
time-mode=running-time font-desc=Sans,36 valignment=bottom ! videoconvert !
queue ! video/x-raw,framerate=1/1 ! xvimagesink

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